Drive security session manager

ABSTRACT

A storage device has a storage medium, a controller, and a session manager. The storage medium is partitioned into one or more security partitions. The controller is adapted to read and write data to and from the storage medium and to enable security sessions over an interface between one or more host systems and one or more security partitions. The session manager within the storage device is adapted to monitor parameters associated with the one or more security sessions.

CROSS-REFERENCE TO RELATED APPLICATION

None.

FIELD OF THE INVENTION

The present invention relates to storage devices having hardenedsecurity features, and more particularly, to storage devices adapted tohost and manage security sessions associated with the hardened securityfeatures.

BACKGROUND OF THE INVENTION

Disc drives and other storage subsystems, including flash memory devicesand removable storage devices, typically have a processor (sometimescalled a microprocessor) in their built-in electronics. Computingdevices offer more and more security features every day, from improvedencryption technologies to personal firewalls and the like. Recently,storage devices (both internal and external to host computer systems andstand-alone storage systems) have been designed and/or configured tooffer some level of additional security.

One security technique is described in co-pending application Ser. No.09/912,931, filed on Jul. 25, 2001, entitled “METHODS AND SYSTEMS FORPROMOTING SECURITY IN A COMPUTER SYSTEM EMPLOYING ATTACHED STORAGEDEVICES ”, which is incorporated herein by reference in its entirety.Another technique is described in co-pending application Ser. No.10/984,368, filed Nov. 9, 2004, entitled “SYSTEM AND METHOD FORDELIVERING VERSATILE SECURITY, DIGITAL RIGHTS MANAGEMENT, AND PRIVACYSERVICES FROM STORAGE CONTROLLERS”, which is incorporated herein byreference in its entirety.

One type of security technique uses security partitions of a storagedevice to host security provider applications and files. Securitysessions can be initiated with the security provider applications andfiles on the storage device over an interface. As used herein, the term“session” refers to an interaction between system entities (such as ahost computer and a storage device), sometimes involving a user, whereina selected state is maintained for the duration of the interaction. Suchan interaction may not be limited to a single connection between thesystem entities. Generally, a security session comprises a secureinteraction with data and/or computer readable instructions stored, forexample, in one or more security partitions implemented on the storagedevice.

Conventionally, sessions are terminated by the host system. However,there are instances where system security or system priorities dictate aneed to terminate a session before the activity occurring within thesession is complete or before the session terminates due to completion.Unfortunately, the host system is ill-equipped to detect such scenarios.

Therefore, there is an ongoing need for a means for detecting atermination condition and for terminating the security session.Embodiments of the present invention provide solutions to these andother problems, and offer other advantages over the prior art.

SUMMARY OF THE INVENTION

A storage device has a storage medium, a controller, and a sessionmanager. The storage medium is partitioned into one or more securitypartitions. The controller is adapted to read and write data to and fromthe storage medium and to enable security sessions over an interfacebetween one or more host systems and one or more security partitions.The session manager within the storage device is adapted to monitorparameters associated with the one or more security sessions.

In one embodiment, a method for managing security sessions on a storagedevice has a storage medium partitioned into one or more securitypartitions. One or more security sessions between a host system and oneor more security partitions are hosted by a controller within thestorage device. A session manager within the storage device monitorsprogrammatically the one or more security sessions for a terminationcondition. Selected security sessions of the one or more securitysessions are terminated by the session manager based on the terminationcondition.

In another embodiment, a system for managing security sessions on astorage device is described. A storage medium is partitioned into one ormore security partitions. A controller is adapted to read and write datato and from the storage medium. A session manager within the storagedevice is adapted to manage security and to terminate one or more of thesecurity sessions upon detection of a termination condition.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an isometric view of a disc drive.

FIG. 2 is a simplified block diagram of a storage device according to anembodiment of the present invention.

FIG. 3A is a simplified block diagram of a system for providing astorage device side security session termination capability according toan embodiment of the present invention.

FIG. 3B is a simplified, expanded block diagram of the system of FIG.3A.

FIGS. 4A and 4B are simplified command-level timing diagramsillustrating a method for managing a security session according to anembodiment of the present invention.

FIG. 5 is a simplified flow diagram illustrating a security sessionauthentication process according to an embodiment of the presentinvention.

FIG. 6 is a command-level timing diagram illustrating a method forauthenticating a creation of a new security session according to anembodiment of the present invention.

FIG. 7 is a simplified flow diagram of a methodology for managingsecurity sessions on the storage device according to an embodiment ofthe present invention.

FIG. 8 is a simplified flow diagram illustrating a method ofauthenticating a new session according to an embodiment of the presentinvention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

FIG. 1 is an isometric view of a disc drive 100 in which embodiments ofthe present invention are useful. Disc drive 100 includes a housing witha base 102 and a top cover (not shown). Disc drive 100 further includesa disc pack 106, which is mounted on a spindle motor (not shown) by adisc clamp 108. Disc pack 106 includes a plurality of individual discs,which are mounted for co-rotation about central axis 109. Each discsurface has an associated disc head slider 110 to which a read/writetransducer (not shown) is mounted, for communication with the discsurface.

In the example shown in FIG. 1, disc head sliders 110 are supported bysuspensions 112 which are in turn attached to track accessing arms 114of an actuator 116. The actuator shown in FIG. 1 is of the type known asa rotary moving coil actuator and includes a voice coil motor (VCM),shown generally at 118. Voice coil motor 118 rotates actuator 116 withits attached disc head sliders 110 (and associated read/writetransducers) about a pivot shaft 120 to position the disc head slider110 over a desired data track along an arcuate path 122 between a discinner diameter 124 and a disc outer diameter 126. Voice coil motor 118is driven by servo electronics 130 based on signals generated by heads110 and a host system 101. The host system 101 is coupled to the discdrive 100 via an interface 103. Data and control signals pass from thehost system 101 to the disc drive 100 over the interface 103.

FIG. 2 is a simplified block diagram of a storage device 200 accordingto an embodiment of the present invention. The storage device 200includes an input interface 201, and a controller 202 coupled to astorage medium 204 and adapted to read and write data to and from thestorage medium via read/write heads (element 110 in FIG. 1). A sessionmanager 206 is provided to monitor and manage all security sessiontransactions over the interface (element 103 in FIG. 1) related to oneor more security partitions (SPs) 208 on the storage medium 204.Finally, the input interface 201 is coupled to a host system 210 via aninterface 212. As used herein, the term “Security Session” refers to anauthenticated interaction between an external device and a securitypartition of the storage medium over the interface between the storagedevice and the host system. In a server context, the security sessionmay be established between a device on a network and the securitypartition of the storage medium via the host system interface. It shouldbe understood that the interface 212 may be a standard peripheral deviceinterface (for example, an ATA interface between a computer system and astorage device) or the interface 212 may be a direct connection to anetwork (if the storage device 200 is a standalone storage system). Asused herein, the term “security partition” refers to a logical area on astorage medium to which access is tightly controlled, preferably by acontroller, by circuitry, or by software contained within the storagedevice. In one embodiment, a security partition contains an authoritytable, which is used by the controller, by circuitry and/or byassociated software within the storage device to authenticate accessrequests to data stored within the security partition. In this instance,if an access request to data within the security partition instantiateda security session which ran unusually long, which resulted inunexpected data transmissions or errors, and the like, it is desirablefor the storage device to monitor and terminate such security sessionsusing the session manager 206.

A processor 207 is provided for processing data associated with securitysessions. The session manager 206 preferably is a software applicationfor managing the allocation of time and resources of the processor 207.The session manager 206 may be part of the firmware 209 associated withthe storage device 200, which includes instructions for the controller202 to maintain control over access to the security partitions 208 onthe storage medium 204. The session manager 206 is a softwareapplication or agent internal to the storage device 200 that isresponsible for managing all security session activity for multiple,simultaneous security sessions over the interface 201. The sessionmanager 206 may be embedded in the firmware 209 of the storage device200. Preferably, the session manager 206 is integrated into thecontroller 202 of the storage device 200, which includes the processor207 and the firmware 209 adapted to control reading and writing of datato and from the storage medium 204. The session manager 206 is adaptedto monitor the state of all activities implicating a security partition208 (and received over the interface from a host system), and is adaptedto manage resource allocation, to authenticate session requests, tomonitor the progress of each session, and to render decisions aboutwhether to terminate any particular security session. The sessionmanager 206 is able to perform its functions without intervention by ahost system.

Some reasons for needing to terminate a session might include (but arenot limited to) power failure, tamper detection, excessive time in thesession, no resources available, or insufficient priority level tocomplete a task in a reasonable amount of time. In the latter instance,it may be that a particular entity's request for resources has a lowpriority, which is likely to be displaced by a higher priority sessionor request, thereby making it difficult for the task to be completedwithin a reasonable amount of time. Additional reasons may includeproblems with commands received over the interface and/or parametersassociated with the session. Inability to recognize the requesting usermay result in session termination. Additionally, non-recoverable errorconditions may lead to session termination. In each instance, thesession manager 206, which is internal to the storage device, identifiesthe termination condition and terminates the session. The sessionmanager 206 is adapted to work closely with the processor 207 of thestorage device 200 to manage resources and to allocate processor time tovarious co-routines.

Thus, the session manager 206 is implemented on the storage device 200(on the drive-side or storage-device side) and adapted to terminate asession without intervention by a host system and without a terminatecommand being received over the interface. The present invention isdirected to the recognition that there are occasions where neither thehost system nor the originating entity recognizes a need to terminate aparticular security session. For example, if the requesting system hacksinto the drive to establish a session, or if a system maliciouslyattacks the system such as through a denial of service attack, the hostsystem is typically not adapted to recognize that a particular securitysession is not desirable, particularly once the authentication processis successful. With the present invention, each command issued to thesecurity partition 208 can be controlled with a session token to insurethat a particular session is valid, that resources are available, andthat the session should not be terminated.

For the purpose of illustration, a security partition may be used, forexample, by a software-based firewall program, to store selected filesand optionally one or more dynamic link libraries. In this instance, thecontroller of the storage device and/or firmware (software) within thestorage device can prevent the operating system of a host computer fromgaining access to the security partition, thereby securing the firewallsoftware from unauthorized access. On startup of the host computer, thefirewall software can be loaded and can establish a secure session withthe security partition in order to obtain access permissions andsettings.

FIG. 3A illustrates a simplified block diagram of an overview of anembodiment of the present invention. The system 300 includes a sessionmanager 302 for authenticating session requests, initiating co-routinetasks in a task manager queue, monitoring the state of all pending andactive sessions, observing timeouts and other error conditions, anddetermining when to terminate a security session. Results (whethernormal or abnormal) may be reported back to a host system, but thedecision to terminate a session due to any number of conditions can bemade by the session manager 302 without host intervention.

The session manager 302 manages one or more session tasks 304, which mayinvoke interface message utilities 306, stream utilities 308,co-routines 310, remote procedure call (RPC) application programminginterface (API) 312, and security partition log 314. Specifically, thesession manager 302 instantiates each session task 304 based onauthenticated session requests. The session manager 302 then tracks theactivity or inactivity of each session task 304, and manages systemresources. By managing system resources, the session manager 302monitors transaction time, and various other parameters associated witha security session. If such parameters exceed a predetermined limit orare different from normal operations, the session manager 302 terminatesthe session.

FIG. 3B illustrates a more detailed block diagram of the embodiment ofFIG. 3A. The system 300 includes a session manager 302 whichinstantiates one or more session tasks 304. Each session task 304 mayimplicate one or more functions of the interface message utilities 306,stream utilities 308, co-routines 310, RPC API 312, and/or the securitypartition log 314.

The session manager 302 includes a number of functions, which areinternal to the session manager 302. The session manager commandfunction and the session manager response function are public functions,whereas the find session function, manage open session function, queuesession function, and status command function are all internalfunctions, which cannot be accessed from outside of the session manager302. These functions are private functions, which cannot be accessed byother classes.

The functions shown in FIG. 3B are provided for illustration purposesonly, and are not intended to be exhaustive. Among other activities, thesession manager 302 is responsible for storage device session co-routinecreation and termination, as well as priority setting. A request toinitiate a new session typically comes from a host (such as a computersystem attached to the storage device) via an RPC API function call(such as NewSession). Such a function call would result in one of thefollowing outcomes: accept session, reject session or conditionallyaccept session. If the session is accepted, the new session is createdtogether with a pair of streams that link the session to the sessionmanager 302. The new session co-routine performs authentication.

For example, the session can be rejected if a maximum number of drivesessions are already active, if a maximum number of sessions for thesecurity partition already exist, or if some other out-of-bounds typecondition would be created by granting the requests. If the session isconditionally accepted, a wait can be specified, if, for example, othersessions on the security partition prevent immediate acceptance of thesession. This is handled like the “accept session” case with theaddition of an initial section of code in the session co-routine thatwaits for the security partition to become available or for anyspecified wait time to expire.

Once created, an active security session can be terminated by requestfrom the host session task (using a CloseSession command), a requestfrom the storage device session co-routine, or from a systemtermination. A system termination results from some abnormal condition.For example, a co-routine stalls or takes too much time, or a processreturns an error, or a higher priority session preemptively requiresimmediate security partition access. For the purpose of the presentinvention, security sessions can be co-routines 310. Co-routines 310 canconnect to a security partition of a storage device, and then yieldaccess both to the security partition and to the microprocessor of thestorage device (as needed) and regain access when the microprocessorbecomes available.

FIGS. 4A and 4B depict a command-level timing diagram illustrating asession termination process due to an error condition involving invalidparameters received as part of a command. The system 400 includes aclient interface 402, a Diagnostic Bridge Protocol 404 (which may bemanufacturer specific, such as a Seagate Diagnostic Bridge Protocol(SDBP) 404), a Systems Information Manager (SIM) 406, the sessionmanager 408, session tasks 410, interface message utilities 412, streamutilities 414, the RPC API 416, co-routines 418 and data utilities 420.

For readability purposes, FIGS. 4A and 4B depict a flow of a singlecommand through the system 400. Time increases down the page, and FIG.4B depicts operations that occur sequentially in time after those ofFIG. 4A. In general, the session manager 408 has the capability ofterminating a security session. A precondition is that the session isalready active (NewSession command was previously received), and anauthenticate command is received containing one or more invalidparameters.

After the packet arrives at the interface, it is routed to the sessionmanager 408 via invocation of a session manager command. The sessionmanager 408 invokes a SIM read file content command. The SIM 406 invokesa SDBP get incoming buffer file pointer command, which returns thebuffer file pointer. The SIM 406 then returns the router header infofrom the received authentication command to the session manager 408based on the pointer information. The session manager 408 once againcontacts the SIM 406, which in turn contacts the SDBP 404 to retrievethe packet header for the session manager 408. The packet header foreach packet in a superpacket (which contains one or more packets) isretrieved. These steps can be conceptualized as a read router header andsuperpacket header process.

If the packet corresponds to an open session, the session manager 408queues the packet to the open session. The session manager 408 invokesan internal find session command, then generates a status responsecommand to the interface message utilities 412, which opens a writestream via the stream utilities 414. Finally, the session manager 408queues the session via an internal function call.

While there is more data in the packet, the system continues to retrievepacket header information and queue the information to the appropriatesession. If all sessions are open, meaning that there are no moreavailable sessions, a message is returned to the interface clientindicating that no security partition session are available and zero“buffer credit” is provided. In this instance, credit refers to bufferspace available for command reception. Credit is required to establishand interact via security session. Alternatively, an unopened sessionmay be reserved for the user and a packet may be routed to theappropriate session task.

At this point, the session manager 408 invokes a trust session via afunction call associated with the session tasks 410. The session tasks410 request the co-routines to yield access to the CPU. The sessiontasks 410 wait for CPU access to be gained. The session tasks 410 wakeup and initialize the trust session, which then waits for message eventsand processes messages until the session is terminated.

The session initiates a read stream command to the stream utilities 414,which returns subpacket information associated with the trust session.For each subpacket in a packet, the read stream command returns thesubpacket information. Then the appropriate command is called.

In this instance, the packet contained an authenticate session command.The session manager 408 calls the RPC API 406 via the authenticatesession command. Though the call is indicated as coming from the sessiontasks 410, the session manager 408 initiates the authenticate routine.At this point, the subpacket is parsed into a session scratch buffer.Each token from the subpacket is decoded and processed via a get tokencommand internal to the RPC API 416. The response is queued to the hostand if a token is a bad token, an error code is returned. Otherwise, asuccess token is returned. In general, the get token command calls aread stream command of the stream utilities 414 to parse the subpacketfor the command. The get token function also calls the yield CPU commandof the co-routines 418 repeatedly, and may yield the CPU temporarily tohigher priority tasks.

Data is read from the stream until the end of the stream is reached oruntil there is no more data in the stream. An authenticate command iscalled by the RPC API 416, which detects an error in a token value. Theauthenticate command sets the session state to “closed”, and returns an“SP Invalid” parameter to the trust session.

The session tasks 410 calls the log entry command of the data utilities420, logs the SP Invalid information to the security partition log, andflushes the input or scratch buffer.

FIG. 5 illustrates a simplified flow diagram of a process forauthenticating a trust session according to an embodiment of the presentinvention. An authenticate command associated with an active session isreceived (block 500). The session manager calls the RPC API toauthenticate the session (block 502). The session token is retrieved(block 504) from the packet. Subpacket information is read via afunction call to the stream utilities (block 506). RPC API gains accessto the microprocessor of the storage device from other session tasks(co-routines) (block 508). The RPC API tests the session token(s) (block510).

If the token value is not correct (block 512), the RPC API detects anerror in the token value (block 514). The session manager logs an entryin the security partition log (block 516). The session manager generatesan error message to the interface message utilities (block 518), andflushes the input buffer (block 520).

If the token value is correct (block 512), the session manager logs anentry in the security partition log (block 522), generates a message tothe interface message utilities (block 524) and generates a successmessage (block 526).

FIG. 6 depicts a command-level timing diagram of a session where anunauthorized user attempts to open a new session and fails. In general,the process proceeds as described with respect to FIGS. 4A and 4B,except that the session is not already open and the user requesting anew security session is not an authorized user.

In this instance, when the system attempts to open a new session by acall from the session manager 608 to the RPC API 616, the RPC APIdetects that the user is not authorized. Specifically, the RPC API 616retrieves and examines the session tokens of the requesting user. Thereis an error in the user identification, which means that the securitysession is not authorized. Once again, the system records the failedattempt and flushes the scratch buffer.

In general, the session manager 608 controls access to the storagedevice resources within the security partitions. In this manner,unauthorized requests and requests containing errors can be rejected,thereby terminating a security session. More importantly, as long as thesecurity session remains open, the header information and authorizationtokens are tested to ensure that the session is still valid. If thesession lasts an excessive period of time, if the session startsencountering unexpected errors and so on, the session manager terminatesthe security session.

FIG. 7 depicts a simplified flow diagram of an embodiment of the presentinvention in its simplest form. A storage device receives input relatedto one or more security sessions on the storage device (block 700). Thesecurity session input is passed to the session manager (block 702). Thesession manager manages all security session activity programmatically(block 704). If a problem is detected with an authenticated securitysession, the session manager terminates the problematic security session(block 706).

FIG. 8 depicts a simplified flow diagram of a process for terminating arequest for a new security session received from an unauthorized user. Anew session command is received (block 800). The session manager callsthe RPC API to open a new session (block 802). The session managerretrieves the session token (block 804). The session manager reads thesubpacket information via a function call to the stream utilities (block806). The session manager gains access to the CPU from the co-routines(block 808). The session manager attempts to authenticate the requestinguser or device (block 810).

If the user is not authorized (block 812), the session manager detectsan error in the user credentials (block 814). The session manager logsan entry in the security partition log (block 816), generates an errormessage to the interface message utilities (block 818), and flushes theinput buffer (block 820).

If the user is authorized (block 812), the session manager logs an entryin the security partition log (block 822), generates a message to theinterface message utilities (block 824) and generates a success message(block 826).

In general, termination of a security session (either upon request orafter the session is initiated)_by the session manager generallyincludes the steps of identifying a problem associated with the securitysession and terminating the problematic security session. Thetermination step often includes logging the problem, notifying theinterface message utilities, and flushing the input buffer (blocks816-820). In some instances, the session manager may roll back changesinitiated from the security session to a pre-session state.

If the user is authorized, the request contains the correct parametersand so on, then the trust session (security session) between the user(device) and the security partition is instantiated. In general, thesession manager is used to host, manage, and supervise security sessionbetween an external device (or host application) and a security providerstored in a security partition of the storage device. The sessionmanager provides a storage device-side means for terminating a securitysession without requiring intervention by a host system.

Upon receiving an input direct to a security session (new or existing)from, for example, a host system, the session manager either accepts theinput, rejects the input, or conditionally accepts the input. Oncecreated, an active security session can be terminated by the sessionmanager based on a number of different reasons, including detection ofan unauthorized user, detection of an error with a received command(including parameters associated with a command), detection ofunauthorized commands or scripts, detection of excessive session time,detection of no data flow, and so on.

While the present invention has largely been discussed in terms of astorage device coupled to a host, it should be understood that a sessionmanager may server equally well in a stand-alone storage device that isaccessible via a network (or in a stand-alone storage device that isembedded as part of a system that has no host or network connections).In general, the session manager manages and monitors all securitysession transactions between external devices and the securitypartitions of the storage device. Generally, such transactions occurover an interface, either to a host system or to a network.Consequently, the session manager is adapted to make determinationsregarding the state of existing security sessions and to terminate thosesecurity sessions that are determined to be problematic. Additionally,the session manager may perform other functions not addressed in detailherein. For example, if the authentication process requires third-partycertification (such as with a certificate that is certified by acertificate-authority), the session manager may initiate and host asecure communication link via a tunnel connecting the storage devicedirectly to the third-party certificate authority. In this manner, ahost machine (if one is present) can negotiate a secure socket layertype connection, which the session manager can use to establish anencrypted link to securely communicate with the certificate authority.The session manager creates a tunnel within a tunnel so that thecertification process occurs via a direct link between the storagedevice and the certifying authority (bypassing the host machine).

Finally, though the above-discussion has detailed a process for handlingtwo commands (authenticate and new session), the session manager isadapted to monitor any ongoing session by repeatedly testing the sessiontokens to make sure that the tokens have not expired, that the keys arevalid, that the system or the session stream have not been hacked, andso on. By testing every command, access controls can be tightly managedby the session manager, thereby providing the session manager with theopportunity to terminate sessions when the parameters or the command donot satisfy the required credentials.

It is to be understood that even though numerous characteristics andadvantages of various embodiments of the invention have been set forthin the foregoing description, together with details of the structure andfunction of various embodiments of the invention, this disclosure isillustrative only, and changes may be made in detail, especially inmatters of structure and arrangement of parts within the principles ofthe present invention to the full extent indicated by the broad generalmeaning of the terms in which the appended claims are expressed. Forexample, the particular elements may vary depending on the particularapplication for the storage system while maintaining substantially thesame functionality without departing from the scope and spirit of thepresent invention. In addition, although the preferred embodimentdescribed herein is directed to a session manager and securitymanagement system for hosting and managing multiple simultaneoussecurity sessions on a storage device, it will be appreciated by thoseskilled in the art that the teachings of the present invention can beapplied to any system adapted to host secure communications between twoor more entities, without departing from the scope and spirit of thepresent invention.

1. A storage device comprising: a storage medium partitioned into one ormore security partitions; a controller adapted to read and write data toand from the storage medium, the controller adapted to enable securitysessions between one or more host systems and one or more securitypartitions; and a session manager within the storage device adapted tomonitor parameters associated with a plurality of security sessions,wherein the session manager is adapted to monitor security sessionactivity for each security session after authentication of each securitysession.
 2. The storage device of claim 1, and further comprising aninterface configured to receive a request from a host system, whereinthe interface is an ATA or SCSI interface.
 3. The storage device ofclaim 1 wherein the session manager is adapted to terminate selectedsecurity sessions of the plurality of security sessions based on themonitored parameters.
 4. The storage device of claim 1 wherein thecontroller comprises: a processor adapted to process commands and data;and firmware containing instructions for operation of the controller. 5.The storage device of claim 4 wherein the session manager managesprocessing resources of the processor.
 6. The storage device of claim 1wherein the session manager comprises a software application.
 7. Thestorage device of claim 1 wherein the monitored parameters comprise asession priority level, and wherein the session manager is adapted toterminate a selected security session for a security session having ahigher priority level.
 8. The storage device of claim 1 wherein themonitored parameters comprise a session duration parameter and whereinthe session manager is adapted to terminate a selected security sessionbased on the session duration.
 9. A method for managing securitysessions on a storage device comprising: hosting one or more securitysessions between a host system and one or more security partitions usinga controller within the storage device, wherein hosting comprisesreceiving a request from the host system for creation of a securitysession, authenticating the host system, and creating a security sessionbetween the requesting entity and a security partition of the storagedevice; monitoring the one or more security sessions for a terminationcondition using a session manager within the storage device; andterminating selected security sessions of the one or more securitysessions with the session manager based on the termination condition.10. The method of claim 9 wherein the step of managing comprises:receiving input associated with security sessions; directing thereceived input to an associated security session; and monitoringsecurity session activity for the termination condition.
 11. The methodof claim 9 wherein the termination condition comprises a sessionduration that exceeds a predetermined limit.
 12. The method of claim 9wherein the step of managing further comprises: retrieving session tokeninformation associated with the security session; and testing thesession token information before processing security session informationreceived over the peripheral interface.
 13. The method of claim 9wherein the termination condition comprises an unauthorized user. 14.The method of claim 9 wherein the step of terminating furthercomprising: flushing information associated with the security sessionfrom an input buffer if the termination condition is detected duringmonitoring.
 15. The method of claim 9 and further comprising: logginginformation related to termination of the security session.
 16. A systemfor managing security sessions on a storage device comprising: a storagemedium partitioned into one or more security partitions; a controlleradapted to establish an active security session with one or moresecurity partitions; and a session manager within the storage deviceadapted to manage the active security session with the one or moresecurity partitions, wherein the session manager is adapted to terminatethe active security session upon detection of a termination conditionassociated with the active security session.
 17. The system of claim 16wherein the termination condition comprises excessive session time or noavailable security sessions.
 18. The system of claim 16 wherein thetermination condition comprises a non-recoverable error condition aftera number of retry attempts.
 19. The system of claim 16 and furthercomprising: a set of commands stored on the storage device, the set ofcommands accessible to the session manager for managing, monitoring andterminating security sessions.
 20. The system of claim 16 wherein thesession manager is configured to monitor security session activityassociated with the active security session after authentication of theactive security session.